package basic;

import com.google.common.collect.Sets;

import java.util.Set;

public class SetDemo {

    public static void main(String[] args) {
        Set<String> set = Sets.newHashSet();
        set.add("aaa");
        set.add("aaa");
        set.add("aaa");
        System.out.println(set.size());
    }
}
